Finding the Fourth Proportional to 78,586.31, 108,449 and 42,776.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,586.31 : 108,449 = 42,776.21 : x
2. Step 2: Convert to fraction form
   78,586.31/108,449 = 42,776.21/x
3. Step 3: Cross multiply
   78,586.31x = 108,449 × 42,776.21
4. Step 4: Simplify right side
   78,586.31x = 4,639,037,198.29
5. Step 5: Solve for x
   x = 4,639,037,198.29/78,586.31
6. Step 6: Final answer
   x = 59,031.11