Finding the Fourth Proportional to 15,978.34, 23,978.31 and 5,590.18

Step by Step Solution

1. Step 1: Write the proportion equation
   15,978.34 : 23,978.31 = 5,590.18 : x
2. Step 2: Convert to fraction form
   15,978.34/23,978.31 = 5,590.18/x
3. Step 3: Cross multiply
   15,978.34x = 23,978.31 × 5,590.18
4. Step 4: Simplify right side
   15,978.34x = 134,043,069.00
5. Step 5: Solve for x
   x = 134,043,069.00/15,978.34
6. Step 6: Final answer
   x = 8,389.05