Finding the Fourth Proportional to 100,061.28, 138,112.56 and 57,636.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,061.28 : 138,112.56 = 57,636.72 : x
2. Step 2: Convert to fraction form
   100,061.28/138,112.56 = 57,636.72/x
3. Step 3: Cross multiply
   100,061.28x = 138,112.56 × 57,636.72
4. Step 4: Simplify right side
   100,061.28x = 7,960,354,949.20
5. Step 5: Solve for x
   x = 7,960,354,949.20/100,061.28
6. Step 6: Final answer
   x = 79,554.80