Finding the Fourth Proportional to 12,938.79, 19,396.71 and 7,660.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.79 : 19,396.71 = 7,660.83 : x
2. Step 2: Convert to fraction form
   12,938.79/19,396.71 = 7,660.83/x
3. Step 3: Cross multiply
   12,938.79x = 19,396.71 × 7,660.83
4. Step 4: Simplify right side
   12,938.79x = 148,594,897.87
5. Step 5: Solve for x
   x = 148,594,897.87/12,938.79
6. Step 6: Final answer
   x = 11,484.45