Finding the Fourth Proportional to 1,070.42, 1,601.72 and 631.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.42 : 1,601.72 = 631.88 : x
2. Step 2: Convert to fraction form
   1,070.42/1,601.72 = 631.88/x
3. Step 3: Cross multiply
   1,070.42x = 1,601.72 × 631.88
4. Step 4: Simplify right side
   1,070.42x = 1,012,083.67
5. Step 5: Solve for x
   x = 1,012,083.67/1,070.42
6. Step 6: Final answer
   x = 945.50