Finding the Fourth Proportional to 122,510.72, 169,075.68 and 72,200

Step by Step Solution

1. Step 1: Write the proportion equation
   122,510.72 : 169,075.68 = 72,200 : x
2. Step 2: Convert to fraction form
   122,510.72/169,075.68 = 72,200/x
3. Step 3: Cross multiply
   122,510.72x = 169,075.68 × 72,200
4. Step 4: Simplify right side
   122,510.72x = 12,207,264,096
5. Step 5: Solve for x
   x = 12,207,264,096/122,510.72
6. Step 6: Final answer
   x = 99,642.42