Finding the Fourth Proportional to 116,978.16, 161,240.24 and 91,439.40

Step by Step Solution

1. Step 1: Write the proportion equation
   116,978.16 : 161,240.24 = 91,439.40 : x
2. Step 2: Convert to fraction form
   116,978.16/161,240.24 = 91,439.40/x
3. Step 3: Cross multiply
   116,978.16x = 161,240.24 × 91,439.40
4. Step 4: Simplify right side
   116,978.16x = 14,743,710,801.46
5. Step 5: Solve for x
   x = 14,743,710,801.46/116,978.16
6. Step 6: Final answer
   x = 126,038.15