Finding the Fourth Proportional to 1,052.48, 1,577.70 and 402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,052.48 : 1,577.70 = 402.72 : x
2. Step 2: Convert to fraction form
   1,052.48/1,577.70 = 402.72/x
3. Step 3: Cross multiply
   1,052.48x = 1,577.70 × 402.72
4. Step 4: Simplify right side
   1,052.48x = 635,371.34
5. Step 5: Solve for x
   x = 635,371.34/1,052.48
6. Step 6: Final answer
   x = 603.69