Finding the Fourth Proportional to 1,345.02, 1,856.35 and 820.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.02 : 1,856.35 = 820.95 : x
2. Step 2: Convert to fraction form
   1,345.02/1,856.35 = 820.95/x
3. Step 3: Cross multiply
   1,345.02x = 1,856.35 × 820.95
4. Step 4: Simplify right side
   1,345.02x = 1,523,970.53
5. Step 5: Solve for x
   x = 1,523,970.53/1,345.02
6. Step 6: Final answer
   x = 1,133.05