Finding the Fourth Proportional to 13,978.22, 19,289.67 and 7,690.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.22 : 19,289.67 = 7,690.70 : x
2. Step 2: Convert to fraction form
   13,978.22/19,289.67 = 7,690.70/x
3. Step 3: Cross multiply
   13,978.22x = 19,289.67 × 7,690.70
4. Step 4: Simplify right side
   13,978.22x = 148,351,065.07
5. Step 5: Solve for x
   x = 148,351,065.07/13,978.22
6. Step 6: Final answer
   x = 10,613.02