Finding the Fourth Proportional to 1,038.15, 1,557.98 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.15 : 1,557.98 = 648.72 : x
2. Step 2: Convert to fraction form
   1,038.15/1,557.98 = 648.72/x
3. Step 3: Cross multiply
   1,038.15x = 1,557.98 × 648.72
4. Step 4: Simplify right side
   1,038.15x = 1,010,692.79
5. Step 5: Solve for x
   x = 1,010,692.79/1,038.15
6. Step 6: Final answer
   x = 973.55