Finding the Fourth Proportional to 42,128.34, 63,147.53 and 21,026.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,128.34 : 63,147.53 = 21,026.82 : x
2. Step 2: Convert to fraction form
   42,128.34/63,147.53 = 21,026.82/x
3. Step 3: Cross multiply
   42,128.34x = 63,147.53 × 21,026.82
4. Step 4: Simplify right side
   42,128.34x = 1,327,792,036.12
5. Step 5: Solve for x
   x = 1,327,792,036.12/42,128.34
6. Step 6: Final answer
   x = 31,517.79