Finding the Fourth Proportional to 288,595.50, 432,899.73 and 99,055.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,595.50 : 432,899.73 = 99,055.50 : x
2. Step 2: Convert to fraction form
   288,595.50/432,899.73 = 99,055.50/x
3. Step 3: Cross multiply
   288,595.50x = 432,899.73 × 99,055.50
4. Step 4: Simplify right side
   288,595.50x = 42,881,099,205.02
5. Step 5: Solve for x
   x = 42,881,099,205.02/288,595.50
6. Step 6: Final answer
   x = 148,585.47