Finding the Fourth Proportional to 286,139.86, 429,287.55 and 99,165.94

Step by Step Solution

1. Step 1: Write the proportion equation
   286,139.86 : 429,287.55 = 99,165.94 : x
2. Step 2: Convert to fraction form
   286,139.86/429,287.55 = 99,165.94/x
3. Step 3: Cross multiply
   286,139.86x = 429,287.55 × 99,165.94
4. Step 4: Simplify right side
   286,139.86x = 42,570,703,426.05
5. Step 5: Solve for x
   x = 42,570,703,426.05/286,139.86
6. Step 6: Final answer
   x = 148,775.86