Finding the Fourth Proportional to 1,054.55, 1,455.01 and 612.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.55 : 1,455.01 = 612.47 : x
2. Step 2: Convert to fraction form
   1,054.55/1,455.01 = 612.47/x
3. Step 3: Cross multiply
   1,054.55x = 1,455.01 × 612.47
4. Step 4: Simplify right side
   1,054.55x = 891,141.17
5. Step 5: Solve for x
   x = 891,141.17/1,054.55
6. Step 6: Final answer
   x = 845.05