Finding the Fourth Proportional to 1,054.90, 1,455.69 and 612.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.90 : 1,455.69 = 612.82 : x
2. Step 2: Convert to fraction form
   1,054.90/1,455.69 = 612.82/x
3. Step 3: Cross multiply
   1,054.90x = 1,455.69 × 612.82
4. Step 4: Simplify right side
   1,054.90x = 892,075.95
5. Step 5: Solve for x
   x = 892,075.95/1,054.90
6. Step 6: Final answer
   x = 845.65