Finding the Fourth Proportional to 101,338.43, 139,886.46 and 90,709.61

Step by Step Solution

1. Step 1: Write the proportion equation
   101,338.43 : 139,886.46 = 90,709.61 : x
2. Step 2: Convert to fraction form
   101,338.43/139,886.46 = 90,709.61/x
3. Step 3: Cross multiply
   101,338.43x = 139,886.46 × 90,709.61
4. Step 4: Simplify right side
   101,338.43x = 12,689,045,531.45
5. Step 5: Solve for x
   x = 12,689,045,531.45/101,338.43
6. Step 6: Final answer
   x = 125,214.55