Finding the Fourth Proportional to 265,128.96, 397,700.16 and 78,146.88

Step by Step Solution

1. Step 1: Write the proportion equation
   265,128.96 : 397,700.16 = 78,146.88 : x
2. Step 2: Convert to fraction form
   265,128.96/397,700.16 = 78,146.88/x
3. Step 3: Cross multiply
   265,128.96x = 397,700.16 × 78,146.88
4. Step 4: Simplify right side
   265,128.96x = 31,079,026,679.50
5. Step 5: Solve for x
   x = 31,079,026,679.50/265,128.96
6. Step 6: Final answer
   x = 117,222.30