Finding the Fourth Proportional to 1,038.71, 1,556.06 and 648.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.71 : 1,556.06 = 648.86 : x
2. Step 2: Convert to fraction form
   1,038.71/1,556.06 = 648.86/x
3. Step 3: Cross multiply
   1,038.71x = 1,556.06 × 648.86
4. Step 4: Simplify right side
   1,038.71x = 1,009,654.07
5. Step 5: Solve for x
   x = 1,009,654.07/1,038.71
6. Step 6: Final answer
   x = 972.02