Finding the Fourth Proportional to 12,590.61, 18,878.91 and 5,200.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,590.61 : 18,878.91 = 5,200.08 : x
2. Step 2: Convert to fraction form
   12,590.61/18,878.91 = 5,200.08/x
3. Step 3: Cross multiply
   12,590.61x = 18,878.91 × 5,200.08
4. Step 4: Simplify right side
   12,590.61x = 98,171,842.31
5. Step 5: Solve for x
   x = 98,171,842.31/12,590.61
6. Step 6: Final answer
   x = 7,797.23