Finding the Fourth Proportional to 31,136.68, 42,969.10 and 16,989.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,136.68 : 42,969.10 = 16,989.52 : x
2. Step 2: Convert to fraction form
   31,136.68/42,969.10 = 16,989.52/x
3. Step 3: Cross multiply
   31,136.68x = 42,969.10 × 16,989.52
4. Step 4: Simplify right side
   31,136.68x = 730,024,383.83
5. Step 5: Solve for x
   x = 730,024,383.83/31,136.68
6. Step 6: Final answer
   x = 23,445.80