Finding the Fourth Proportional to 13,978.08, 19,289.16 and 7,690.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.08 : 19,289.16 = 7,690.32 : x
2. Step 2: Convert to fraction form
   13,978.08/19,289.16 = 7,690.32/x
3. Step 3: Cross multiply
   13,978.08x = 19,289.16 × 7,690.32
4. Step 4: Simplify right side
   13,978.08x = 148,339,812.93
5. Step 5: Solve for x
   x = 148,339,812.93/13,978.08
6. Step 6: Final answer
   x = 10,612.32