Finding the Fourth Proportional to 123,638.48, 170,492.76 and 105,792.56

Step by Step Solution

1. Step 1: Write the proportion equation
   123,638.48 : 170,492.76 = 105,792.56 : x
2. Step 2: Convert to fraction form
   123,638.48/170,492.76 = 105,792.56/x
3. Step 3: Cross multiply
   123,638.48x = 170,492.76 × 105,792.56
4. Step 4: Simplify right side
   123,638.48x = 18,036,865,541.87
5. Step 5: Solve for x
   x = 18,036,865,541.87/123,638.48
6. Step 6: Final answer
   x = 145,883.92