Finding the Fourth Proportional to 138,582.78, 191,116.71 and 90,818.70

Step by Step Solution

1. Step 1: Write the proportion equation
   138,582.78 : 191,116.71 = 90,818.70 : x
2. Step 2: Convert to fraction form
   138,582.78/191,116.71 = 90,818.70/x
3. Step 3: Cross multiply
   138,582.78x = 191,116.71 × 90,818.70
4. Step 4: Simplify right side
   138,582.78x = 17,356,971,150.48
5. Step 5: Solve for x
   x = 17,356,971,150.48/138,582.78
6. Step 6: Final answer
   x = 125,246.23