Finding the Fourth Proportional to 13,998.42, 20,978.73 and 7,656.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,998.42 : 20,978.73 = 7,656.93 : x
2. Step 2: Convert to fraction form
   13,998.42/20,978.73 = 7,656.93/x
3. Step 3: Cross multiply
   13,998.42x = 20,978.73 × 7,656.93
4. Step 4: Simplify right side
   13,998.42x = 160,632,667.10
5. Step 5: Solve for x
   x = 160,632,667.10/13,998.42
6. Step 6: Final answer
   x = 11,475.06