Finding the Fourth Proportional to 13,978.13, 19,289.81 and 7,690.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.13 : 19,289.81 = 7,690.91 : x
2. Step 2: Convert to fraction form
   13,978.13/19,289.81 = 7,690.91/x
3. Step 3: Cross multiply
   13,978.13x = 19,289.81 × 7,690.91
4. Step 4: Simplify right side
   13,978.13x = 148,356,115.41
5. Step 5: Solve for x
   x = 148,356,115.41/13,978.13
6. Step 6: Final answer
   x = 10,613.45