Finding the Fourth Proportional to 99,350.30, 137,154.15 and 76,638.30

Step by Step Solution

1. Step 1: Write the proportion equation
   99,350.30 : 137,154.15 = 76,638.30 : x
2. Step 2: Convert to fraction form
   99,350.30/137,154.15 = 76,638.30/x
3. Step 3: Cross multiply
   99,350.30x = 137,154.15 × 76,638.30
4. Step 4: Simplify right side
   99,350.30x = 10,511,260,893.95
5. Step 5: Solve for x
   x = 10,511,260,893.95/99,350.30
6. Step 6: Final answer
   x = 105,800.00