Finding the Fourth Proportional to 89,691, 123,788.16 and 51,987.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89,691 : 123,788.16 = 51,987.12 : x
2. Step 2: Convert to fraction form
   89,691/123,788.16 = 51,987.12/x
3. Step 3: Cross multiply
   89,691x = 123,788.16 × 51,987.12
4. Step 4: Simplify right side
   89,691x = 6,435,389,928.50
5. Step 5: Solve for x
   x = 6,435,389,928.50/89,691
6. Step 6: Final answer
   x = 71,750.68