Finding the Fourth Proportional to 1,030.10, 1,421.54 and 558.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.10 : 1,421.54 = 558.00 : x
2. Step 2: Convert to fraction form
   1,030.10/1,421.54 = 558.00/x
3. Step 3: Cross multiply
   1,030.10x = 1,421.54 × 558.00
4. Step 4: Simplify right side
   1,030.10x = 793,214.34
5. Step 5: Solve for x
   x = 793,214.34/1,030.10
6. Step 6: Final answer
   x = 770.04