Finding the Fourth Proportional to 288,914.31, 433,430.58 and 99,350.06

Step by Step Solution

1. Step 1: Write the proportion equation
   288,914.31 : 433,430.58 = 99,350.06 : x
2. Step 2: Convert to fraction form
   288,914.31/433,430.58 = 99,350.06/x
3. Step 3: Cross multiply
   288,914.31x = 433,430.58 × 99,350.06
4. Step 4: Simplify right side
   288,914.31x = 43,061,354,128.83
5. Step 5: Solve for x
   x = 43,061,354,128.83/288,914.31
6. Step 6: Final answer
   x = 149,045.42