Finding the Fourth Proportional to 5,978.07, 8,251.95 and 5,135.39

Step by Step Solution

1. Step 1: Write the proportion equation
   5,978.07 : 8,251.95 = 5,135.39 : x
2. Step 2: Convert to fraction form
   5,978.07/8,251.95 = 5,135.39/x
3. Step 3: Cross multiply
   5,978.07x = 8,251.95 × 5,135.39
4. Step 4: Simplify right side
   5,978.07x = 42,376,981.51
5. Step 5: Solve for x
   x = 42,376,981.51/5,978.07
6. Step 6: Final answer
   x = 7,088.74