Finding the Fourth Proportional to 78,840, 108,799.20 and 53,733.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,840 : 108,799.20 = 53,733.36 : x
2. Step 2: Convert to fraction form
   78,840/108,799.20 = 53,733.36/x
3. Step 3: Cross multiply
   78,840x = 108,799.20 × 53,733.36
4. Step 4: Simplify right side
   78,840x = 5,846,146,581.31
5. Step 5: Solve for x
   x = 5,846,146,581.31/78,840
6. Step 6: Final answer
   x = 74,152.04