Finding the Fourth Proportional to 100,144.32, 138,196.80 and 57,726.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,144.32 : 138,196.80 = 57,726.72 : x
2. Step 2: Convert to fraction form
   100,144.32/138,196.80 = 57,726.72/x
3. Step 3: Cross multiply
   100,144.32x = 138,196.80 × 57,726.72
4. Step 4: Simplify right side
   100,144.32x = 7,977,647,978.50
5. Step 5: Solve for x
   x = 7,977,647,978.50/100,144.32
6. Step 6: Final answer
   x = 79,661.51