Finding the Fourth Proportional to 5,899.78, 8,151.78 and 5,152.60

Step by Step Solution

1. Step 1: Write the proportion equation
   5,899.78 : 8,151.78 = 5,152.60 : x
2. Step 2: Convert to fraction form
   5,899.78/8,151.78 = 5,152.60/x
3. Step 3: Cross multiply
   5,899.78x = 8,151.78 × 5,152.60
4. Step 4: Simplify right side
   5,899.78x = 42,002,861.63
5. Step 5: Solve for x
   x = 42,002,861.63/5,899.78
6. Step 6: Final answer
   x = 7,119.39