Finding the Fourth Proportional to 105,693.54, 145,861.61 and 63,243.87

Step by Step Solution

1. Step 1: Write the proportion equation
   105,693.54 : 145,861.61 = 63,243.87 : x
2. Step 2: Convert to fraction form
   105,693.54/145,861.61 = 63,243.87/x
3. Step 3: Cross multiply
   105,693.54x = 145,861.61 × 63,243.87
4. Step 4: Simplify right side
   105,693.54x = 9,224,852,384.61
5. Step 5: Solve for x
   x = 9,224,852,384.61/105,693.54
6. Step 6: Final answer
   x = 87,279.25