Finding the Fourth Proportional to 31,008.63, 42,791.61 and 16,861.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,008.63 : 42,791.61 = 16,861.47 : x
2. Step 2: Convert to fraction form
   31,008.63/42,791.61 = 16,861.47/x
3. Step 3: Cross multiply
   31,008.63x = 42,791.61 × 16,861.47
4. Step 4: Simplify right side
   31,008.63x = 721,529,448.27
5. Step 5: Solve for x
   x = 721,529,448.27/31,008.63
6. Step 6: Final answer
   x = 23,268.67