Finding the Fourth Proportional to 118,289.80, 163,417.98 and 77,550.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,289.80 : 163,417.98 = 77,550.72 : x
2. Step 2: Convert to fraction form
   118,289.80/163,417.98 = 77,550.72/x
3. Step 3: Cross multiply
   118,289.80x = 163,417.98 × 77,550.72
4. Step 4: Simplify right side
   118,289.80x = 12,673,182,009.95
5. Step 5: Solve for x
   x = 12,673,182,009.95/118,289.80
6. Step 6: Final answer
   x = 107,136.73