Finding the Fourth Proportional to 42,569.96, 63,861.77 and 12,985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,569.96 : 63,861.77 = 12,985.31 : x
2. Step 2: Convert to fraction form
   42,569.96/63,861.77 = 12,985.31/x
3. Step 3: Cross multiply
   42,569.96x = 63,861.77 × 12,985.31
4. Step 4: Simplify right side
   42,569.96x = 829,264,999.67
5. Step 5: Solve for x
   x = 829,264,999.67/42,569.96
6. Step 6: Final answer
   x = 19,480.05