Finding the Fourth Proportional to 85,810.32, 128,128.50 and 76,867.92

Step by Step Solution

1. Step 1: Write the proportion equation
   85,810.32 : 128,128.50 = 76,867.92 : x
2. Step 2: Convert to fraction form
   85,810.32/128,128.50 = 76,867.92/x
3. Step 3: Cross multiply
   85,810.32x = 128,128.50 × 76,867.92
4. Step 4: Simplify right side
   85,810.32x = 9,848,971,287.72
5. Step 5: Solve for x
   x = 9,848,971,287.72/85,810.32
6. Step 6: Final answer
   x = 114,776.07