Finding the Fourth Proportional to 42,128.28, 63,205.47 and 25,280.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.28 : 63,205.47 = 25,280.10 : x
2. Step 2: Convert to fraction form
   42,128.28/63,205.47 = 25,280.10/x
3. Step 3: Cross multiply
   42,128.28x = 63,205.47 × 25,280.10
4. Step 4: Simplify right side
   42,128.28x = 1,597,840,602.15
5. Step 5: Solve for x
   x = 1,597,840,602.15/42,128.28
6. Step 6: Final answer
   x = 37,927.98