Finding the Fourth Proportional to 102,105.61, 140,905.83 and 56,782.60

Step by Step Solution

1. Step 1: Write the proportion equation
   102,105.61 : 140,905.83 = 56,782.60 : x
2. Step 2: Convert to fraction form
   102,105.61/140,905.83 = 56,782.60/x
3. Step 3: Cross multiply
   102,105.61x = 140,905.83 × 56,782.60
4. Step 4: Simplify right side
   102,105.61x = 8,000,999,382.56
5. Step 5: Solve for x
   x = 8,000,999,382.56/102,105.61
6. Step 6: Final answer
   x = 78,360.04