Finding the Fourth Proportional to 268,501.16, 402,769.52 and 78,978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   268,501.16 : 402,769.52 = 78,978.48 : x
2. Step 2: Convert to fraction form
   268,501.16/402,769.52 = 78,978.48/x
3. Step 3: Cross multiply
   268,501.16x = 402,769.52 × 78,978.48
4. Step 4: Simplify right side
   268,501.16x = 31,810,124,479.93
5. Step 5: Solve for x
   x = 31,810,124,479.93/268,501.16
6. Step 6: Final answer
   x = 118,472.95