Finding the Fourth Proportional to 1,019.86, 1,407.38 and 554.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.86 : 1,407.38 = 554.10 : x
2. Step 2: Convert to fraction form
   1,019.86/1,407.38 = 554.10/x
3. Step 3: Cross multiply
   1,019.86x = 1,407.38 × 554.10
4. Step 4: Simplify right side
   1,019.86x = 779,829.26
5. Step 5: Solve for x
   x = 779,829.26/1,019.86
6. Step 6: Final answer
   x = 764.64