Finding the Fourth Proportional to 65,978.47, 91,125.95 and 43,418.17

Step by Step Solution

1. Step 1: Write the proportion equation
   65,978.47 : 91,125.95 = 43,418.17 : x
2. Step 2: Convert to fraction form
   65,978.47/91,125.95 = 43,418.17/x
3. Step 3: Cross multiply
   65,978.47x = 91,125.95 × 43,418.17
4. Step 4: Simplify right side
   65,978.47x = 3,956,522,300.42
5. Step 5: Solve for x
   x = 3,956,522,300.42/65,978.47
6. Step 6: Final answer
   x = 59,966.87