Finding the Fourth Proportional to 138,262.18, 207,383.52 and 78,911.86

Step by Step Solution

1. Step 1: Write the proportion equation
   138,262.18 : 207,383.52 = 78,911.86 : x
2. Step 2: Convert to fraction form
   138,262.18/207,383.52 = 78,911.86/x
3. Step 3: Cross multiply
   138,262.18x = 207,383.52 × 78,911.86
4. Step 4: Simplify right side
   138,262.18x = 16,365,019,296.55
5. Step 5: Solve for x
   x = 16,365,019,296.55/138,262.18
6. Step 6: Final answer
   x = 118,362.23