Finding the Fourth Proportional to 128,862.39, 193,215.89 and 57,772.17

Step by Step Solution

1. Step 1: Write the proportion equation
   128,862.39 : 193,215.89 = 57,772.17 : x
2. Step 2: Convert to fraction form
   128,862.39/193,215.89 = 57,772.17/x
3. Step 3: Cross multiply
   128,862.39x = 193,215.89 × 57,772.17
4. Step 4: Simplify right side
   128,862.39x = 11,162,501,726.82
5. Step 5: Solve for x
   x = 11,162,501,726.82/128,862.39
6. Step 6: Final answer
   x = 86,623.43