Finding the Fourth Proportional to 138,870.86, 191,641.61 and 75,208.91

Step by Step Solution

1. Step 1: Write the proportion equation
   138,870.86 : 191,641.61 = 75,208.91 : x
2. Step 2: Convert to fraction form
   138,870.86/191,641.61 = 75,208.91/x
3. Step 3: Cross multiply
   138,870.86x = 191,641.61 × 75,208.91
4. Step 4: Simplify right side
   138,870.86x = 14,413,155,983.15
5. Step 5: Solve for x
   x = 14,413,155,983.15/138,870.86
6. Step 6: Final answer
   x = 103,788.20