Finding the Fourth Proportional to 1,090.34, 1,504.16 and 647.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.34 : 1,504.16 = 647.98 : x
2. Step 2: Convert to fraction form
   1,090.34/1,504.16 = 647.98/x
3. Step 3: Cross multiply
   1,090.34x = 1,504.16 × 647.98
4. Step 4: Simplify right side
   1,090.34x = 974,665.60
5. Step 5: Solve for x
   x = 974,665.60/1,090.34
6. Step 6: Final answer
   x = 893.91