Finding the Fourth Proportional to 31,084.76, 42,884.12 and 21,658.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,084.76 : 42,884.12 = 21,658.79 : x
2. Step 2: Convert to fraction form
   31,084.76/42,884.12 = 21,658.79/x
3. Step 3: Cross multiply
   31,084.76x = 42,884.12 × 21,658.79
4. Step 4: Simplify right side
   31,084.76x = 928,817,989.14
5. Step 5: Solve for x
   x = 928,817,989.14/31,084.76
6. Step 6: Final answer
   x = 29,880.18