Finding the Fourth Proportional to 138,436.32, 191,020.50 and 78,003.84

Step by Step Solution

1. Step 1: Write the proportion equation
   138,436.32 : 191,020.50 = 78,003.84 : x
2. Step 2: Convert to fraction form
   138,436.32/191,020.50 = 78,003.84/x
3. Step 3: Cross multiply
   138,436.32x = 191,020.50 × 78,003.84
4. Step 4: Simplify right side
   138,436.32x = 14,900,332,518.72
5. Step 5: Solve for x
   x = 14,900,332,518.72/138,436.32
6. Step 6: Final answer
   x = 107,633.12