Finding the Fourth Proportional to 65,691.57, 90,547.89 and 51,326.34

Step by Step Solution

1. Step 1: Write the proportion equation
   65,691.57 : 90,547.89 = 51,326.34 : x
2. Step 2: Convert to fraction form
   65,691.57/90,547.89 = 51,326.34/x
3. Step 3: Cross multiply
   65,691.57x = 90,547.89 × 51,326.34
4. Step 4: Simplify right side
   65,691.57x = 4,647,491,788.42
5. Step 5: Solve for x
   x = 4,647,491,788.42/65,691.57
6. Step 6: Final answer
   x = 70,747.16