Finding the Fourth Proportional to 31,070.54, 42,862.68 and 21,002.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,070.54 : 42,862.68 = 21,002.49 : x
2. Step 2: Convert to fraction form
   31,070.54/42,862.68 = 21,002.49/x
3. Step 3: Cross multiply
   31,070.54x = 42,862.68 × 21,002.49
4. Step 4: Simplify right side
   31,070.54x = 900,223,008.07
5. Step 5: Solve for x
   x = 900,223,008.07/31,070.54
6. Step 6: Final answer
   x = 28,973.52