Finding the Fourth Proportional to 120,208.58, 165,835.71 and 72,434.78

Step by Step Solution

1. Step 1: Write the proportion equation
   120,208.58 : 165,835.71 = 72,434.78 : x
2. Step 2: Convert to fraction form
   120,208.58/165,835.71 = 72,434.78/x
3. Step 3: Cross multiply
   120,208.58x = 165,835.71 × 72,434.78
4. Step 4: Simplify right side
   120,208.58x = 12,012,272,340.82
5. Step 5: Solve for x
   x = 12,012,272,340.82/120,208.58
6. Step 6: Final answer
   x = 99,928.58