Finding the Fourth Proportional to 2,124.60, 3,186.78 and 1,085.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.60 : 3,186.78 = 1,085.01 : x
2. Step 2: Convert to fraction form
   2,124.60/3,186.78 = 1,085.01/x
3. Step 3: Cross multiply
   2,124.60x = 3,186.78 × 1,085.01
4. Step 4: Simplify right side
   2,124.60x = 3,457,688.17
5. Step 5: Solve for x
   x = 3,457,688.17/2,124.60
6. Step 6: Final answer
   x = 1,627.45