Finding the Fourth Proportional to 65,981.79, 91,038.33 and 39,123

Step by Step Solution

1. Step 1: Write the proportion equation
   65,981.79 : 91,038.33 = 39,123 : x
2. Step 2: Convert to fraction form
   65,981.79/91,038.33 = 39,123/x
3. Step 3: Cross multiply
   65,981.79x = 91,038.33 × 39,123
4. Step 4: Simplify right side
   65,981.79x = 3,561,692,584.59
5. Step 5: Solve for x
   x = 3,561,692,584.59/65,981.79
6. Step 6: Final answer
   x = 53,979.93