Finding the Fourth Proportional to 102,109.06, 140,899.71 and 56,779.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,109.06 : 140,899.71 = 56,779.72 : x
2. Step 2: Convert to fraction form
   102,109.06/140,899.71 = 56,779.72/x
3. Step 3: Cross multiply
   102,109.06x = 140,899.71 × 56,779.72
4. Step 4: Simplify right side
   102,109.06x = 8,000,245,782.86
5. Step 5: Solve for x
   x = 8,000,245,782.86/102,109.06
6. Step 6: Final answer
   x = 78,350.01