Finding the Fourth Proportional to 64,081.59, 87,790.32 and 61,685.68

Step by Step Solution

1. Step 1: Write the proportion equation
   64,081.59 : 87,790.32 = 61,685.68 : x
2. Step 2: Convert to fraction form
   64,081.59/87,790.32 = 61,685.68/x
3. Step 3: Cross multiply
   64,081.59x = 87,790.32 × 61,685.68
4. Step 4: Simplify right side
   64,081.59x = 5,415,404,839.24
5. Step 5: Solve for x
   x = 5,415,404,839.24/64,081.59
6. Step 6: Final answer
   x = 84,507.97