Finding the Fourth Proportional to 105,103.30, 157,424.55 and 91,279.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,103.30 : 157,424.55 = 91,279.30 : x
2. Step 2: Convert to fraction form
   105,103.30/157,424.55 = 91,279.30/x
3. Step 3: Cross multiply
   105,103.30x = 157,424.55 × 91,279.30
4. Step 4: Simplify right side
   105,103.30x = 14,369,602,726.82
5. Step 5: Solve for x
   x = 14,369,602,726.82/105,103.30
6. Step 6: Final answer
   x = 136,718.85