Finding the Fourth Proportional to 42,145.73, 63,156.02 and 17,155.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,145.73 : 63,156.02 = 17,155.21 : x
2. Step 2: Convert to fraction form
   42,145.73/63,156.02 = 17,155.21/x
3. Step 3: Cross multiply
   42,145.73x = 63,156.02 × 17,155.21
4. Step 4: Simplify right side
   42,145.73x = 1,083,454,670.86
5. Step 5: Solve for x
   x = 1,083,454,670.86/42,145.73
6. Step 6: Final answer
   x = 25,707.34