Finding the Fourth Proportional to 42,717.12, 64,085.76 and 14,638.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,717.12 : 64,085.76 = 14,638.56 : x
2. Step 2: Convert to fraction form
   42,717.12/64,085.76 = 14,638.56/x
3. Step 3: Cross multiply
   42,717.12x = 64,085.76 × 14,638.56
4. Step 4: Simplify right side
   42,717.12x = 938,123,242.91
5. Step 5: Solve for x
   x = 938,123,242.91/42,717.12
6. Step 6: Final answer
   x = 21,961.29