Finding the Fourth Proportional to 91,973.07, 137,288.32 and 78,909.39

Step by Step Solution

1. Step 1: Write the proportion equation
   91,973.07 : 137,288.32 = 78,909.39 : x
2. Step 2: Convert to fraction form
   91,973.07/137,288.32 = 78,909.39/x
3. Step 3: Cross multiply
   91,973.07x = 137,288.32 × 78,909.39
4. Step 4: Simplify right side
   91,973.07x = 10,833,337,388.05
5. Step 5: Solve for x
   x = 10,833,337,388.05/91,973.07
6. Step 6: Final answer
   x = 117,788.15