Finding the Fourth Proportional to 102,077.30, 140,997.49 and 78,493.30

Step by Step Solution

1. Step 1: Write the proportion equation
   102,077.30 : 140,997.49 = 78,493.30 : x
2. Step 2: Convert to fraction form
   102,077.30/140,997.49 = 78,493.30/x
3. Step 3: Cross multiply
   102,077.30x = 140,997.49 × 78,493.30
4. Step 4: Simplify right side
   102,077.30x = 11,067,358,281.82
5. Step 5: Solve for x
   x = 11,067,358,281.82/102,077.30
6. Step 6: Final answer
   x = 108,421.35