Finding the Fourth Proportional to 31,008.04, 42,790.80 and 16,861

Step by Step Solution

1. Step 1: Write the proportion equation
   31,008.04 : 42,790.80 = 16,861 : x
2. Step 2: Convert to fraction form
   31,008.04/42,790.80 = 16,861/x
3. Step 3: Cross multiply
   31,008.04x = 42,790.80 × 16,861
4. Step 4: Simplify right side
   31,008.04x = 721,495,678.80
5. Step 5: Solve for x
   x = 721,495,678.80/31,008.04
6. Step 6: Final answer
   x = 23,268.02