Finding the Fourth Proportional to 1,372.89, 2,060.01 and 642.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.89 : 2,060.01 = 642.52 : x
2. Step 2: Convert to fraction form
   1,372.89/2,060.01 = 642.52/x
3. Step 3: Cross multiply
   1,372.89x = 2,060.01 × 642.52
4. Step 4: Simplify right side
   1,372.89x = 1,323,592.48
5. Step 5: Solve for x
   x = 1,323,592.48/1,372.89
6. Step 6: Final answer
   x = 964.09