Finding the Fourth Proportional to 1,670.76, 2,505.30 and 630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,670.76 : 2,505.30 = 630.72 : x
2. Step 2: Convert to fraction form
   1,670.76/2,505.30 = 630.72/x
3. Step 3: Cross multiply
   1,670.76x = 2,505.30 × 630.72
4. Step 4: Simplify right side
   1,670.76x = 1,580,142.82
5. Step 5: Solve for x
   x = 1,580,142.82/1,670.76
6. Step 6: Final answer
   x = 945.76