Finding the Fourth Proportional to 1,638.77, 2,250.48 and 1,402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.77 : 2,250.48 = 1,402.72 : x
2. Step 2: Convert to fraction form
   1,638.77/2,250.48 = 1,402.72/x
3. Step 3: Cross multiply
   1,638.77x = 2,250.48 × 1,402.72
4. Step 4: Simplify right side
   1,638.77x = 3,156,792.94
5. Step 5: Solve for x
   x = 3,156,792.94/1,638.77
6. Step 6: Final answer
   x = 1,926.32