Finding the Fourth Proportional to 72,392.39, 108,810 and 70,842.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,392.39 : 108,810 = 70,842.05 : x
2. Step 2: Convert to fraction form
   72,392.39/108,810 = 70,842.05/x
3. Step 3: Cross multiply
   72,392.39x = 108,810 × 70,842.05
4. Step 4: Simplify right side
   72,392.39x = 7,708,322,916.45
5. Step 5: Solve for x
   x = 7,708,322,916.45/72,392.39
6. Step 6: Final answer
   x = 106,479.75