Finding the Fourth Proportional to 143,896.28, 215,906.59 and 77,258.59

Step by Step Solution

1. Step 1: Write the proportion equation
   143,896.28 : 215,906.59 = 77,258.59 : x
2. Step 2: Convert to fraction form
   143,896.28/215,906.59 = 77,258.59/x
3. Step 3: Cross multiply
   143,896.28x = 215,906.59 × 77,258.59
4. Step 4: Simplify right side
   143,896.28x = 16,680,638,271.91
5. Step 5: Solve for x
   x = 16,680,638,271.91/143,896.28
6. Step 6: Final answer
   x = 115,921.27