Finding the Fourth Proportional to 100,630.99, 138,870.86 and 55,308.62

Step by Step Solution

1. Step 1: Write the proportion equation
   100,630.99 : 138,870.86 = 55,308.62 : x
2. Step 2: Convert to fraction form
   100,630.99/138,870.86 = 55,308.62/x
3. Step 3: Cross multiply
   100,630.99x = 138,870.86 × 55,308.62
4. Step 4: Simplify right side
   100,630.99x = 7,680,755,695.45
5. Step 5: Solve for x
   x = 7,680,755,695.45/100,630.99
6. Step 6: Final answer
   x = 76,325.95