Finding the Fourth Proportional to 286,637,105.89, 429,951,332.12 and 128,958,773.04

Step by Step Solution

1. Step 1: Write the proportion equation
   286,637,105.89 : 429,951,332.12 = 128,958,773.04 : x
2. Step 2: Convert to fraction form
   286,637,105.89/429,951,332.12 = 128,958,773.04/x
3. Step 3: Cross multiply
   286,637,105.89x = 429,951,332.12 × 128,958,773.04
4. Step 4: Simplify right side
   286,637,105.89x = 55,445,996,257,108,744
5. Step 5: Solve for x
   x = 55,445,996,257,108,744/286,637,105.89
6. Step 6: Final answer
   x = 193,436,212.96