Finding the Fourth Proportional to 122,783.60, 169,340.28 and 72,434

Step by Step Solution

1. Step 1: Write the proportion equation
   122,783.60 : 169,340.28 = 72,434 : x
2. Step 2: Convert to fraction form
   122,783.60/169,340.28 = 72,434/x
3. Step 3: Cross multiply
   122,783.60x = 169,340.28 × 72,434
4. Step 4: Simplify right side
   122,783.60x = 12,265,993,841.52
5. Step 5: Solve for x
   x = 12,265,993,841.52/122,783.60
6. Step 6: Final answer
   x = 99,899.28