Finding the Fourth Proportional to 85,374.10, 128,061.15 and 43,902.10

Step by Step Solution

1. Step 1: Write the proportion equation
   85,374.10 : 128,061.15 = 43,902.10 : x
2. Step 2: Convert to fraction form
   85,374.10/128,061.15 = 43,902.10/x
3. Step 3: Cross multiply
   85,374.10x = 128,061.15 × 43,902.10
4. Step 4: Simplify right side
   85,374.10x = 5,622,153,413.42
5. Step 5: Solve for x
   x = 5,622,153,413.42/85,374.10
6. Step 6: Final answer
   x = 65,853.15