Finding the Fourth Proportional to 42,604.74, 63,916.25 and 13,021.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,604.74 : 63,916.25 = 13,021.61 : x
2. Step 2: Convert to fraction form
   42,604.74/63,916.25 = 13,021.61/x
3. Step 3: Cross multiply
   42,604.74x = 63,916.25 × 13,021.61
4. Step 4: Simplify right side
   42,604.74x = 832,292,095.47
5. Step 5: Solve for x
   x = 832,292,095.47/42,604.74
6. Step 6: Final answer
   x = 19,535.20