Finding the Fourth Proportional to 72,389.39, 108,805.50 and 70,839.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,389.39 : 108,805.50 = 70,839.05 : x
2. Step 2: Convert to fraction form
   72,389.39/108,805.50 = 70,839.05/x
3. Step 3: Cross multiply
   72,389.39x = 108,805.50 × 70,839.05
4. Step 4: Simplify right side
   72,389.39x = 7,707,677,710.75
5. Step 5: Solve for x
   x = 7,707,677,710.75/72,389.39
6. Step 6: Final answer
   x = 106,475.25