Finding the Fourth Proportional to 85,521.96, 128,112.84 and 78,212.52

Step by Step Solution

1. Step 1: Write the proportion equation
   85,521.96 : 128,112.84 = 78,212.52 : x
2. Step 2: Convert to fraction form
   85,521.96/128,112.84 = 78,212.52/x
3. Step 3: Cross multiply
   85,521.96x = 128,112.84 × 78,212.52
4. Step 4: Simplify right side
   85,521.96x = 10,020,028,060.76
5. Step 5: Solve for x
   x = 10,020,028,060.76/85,521.96
6. Step 6: Final answer
   x = 117,163.22