Finding the Fourth Proportional to 101,084.31, 139,541.18 and 65,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   101,084.31 : 139,541.18 = 65,291.78 : x
2. Step 2: Convert to fraction form
   101,084.31/139,541.18 = 65,291.78/x
3. Step 3: Cross multiply
   101,084.31x = 139,541.18 × 65,291.78
4. Step 4: Simplify right side
   101,084.31x = 9,110,892,047.89
5. Step 5: Solve for x
   x = 9,110,892,047.89/101,084.31
6. Step 6: Final answer
   x = 90,131.61