Finding the Fourth Proportional to 101,298.50, 139,791.93 and 56,586.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,298.50 : 139,791.93 = 56,586.50 : x
2. Step 2: Convert to fraction form
   101,298.50/139,791.93 = 56,586.50/x
3. Step 3: Cross multiply
   101,298.50x = 139,791.93 × 56,586.50
4. Step 4: Simplify right side
   101,298.50x = 7,910,336,046.95
5. Step 5: Solve for x
   x = 7,910,336,046.95/101,298.50
6. Step 6: Final answer
   x = 78,089.37