Finding the Fourth Proportional to 99,109.60, 136,769.30 and 56,088.29

Step by Step Solution

1. Step 1: Write the proportion equation
   99,109.60 : 136,769.30 = 56,088.29 : x
2. Step 2: Convert to fraction form
   99,109.60/136,769.30 = 56,088.29/x
3. Step 3: Cross multiply
   99,109.60x = 136,769.30 × 56,088.29
4. Step 4: Simplify right side
   99,109.60x = 7,671,156,161.50
5. Step 5: Solve for x
   x = 7,671,156,161.50/99,109.60
6. Step 6: Final answer
   x = 77,400.74