Finding the Fourth Proportional to 100,707.49, 138,967 and 55,385.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100,707.49 : 138,967 = 55,385.56 : x
2. Step 2: Convert to fraction form
   100,707.49/138,967 = 55,385.56/x
3. Step 3: Cross multiply
   100,707.49x = 138,967 × 55,385.56
4. Step 4: Simplify right side
   100,707.49x = 7,696,765,116.52
5. Step 5: Solve for x
   x = 7,696,765,116.52/100,707.49
6. Step 6: Final answer
   x = 76,426.94