Finding the Fourth Proportional to 5,316.77, 7,978.17 and 5,031.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,316.77 : 7,978.17 = 5,031.74 : x
2. Step 2: Convert to fraction form
   5,316.77/7,978.17 = 5,031.74/x
3. Step 3: Cross multiply
   5,316.77x = 7,978.17 × 5,031.74
4. Step 4: Simplify right side
   5,316.77x = 40,144,037.22
5. Step 5: Solve for x
   x = 40,144,037.22/5,316.77
6. Step 6: Final answer
   x = 7,550.46