Finding the Fourth Proportional to 1,980.18, 2,972.07 and 1,056.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.18 : 2,972.07 = 1,056.53 : x
2. Step 2: Convert to fraction form
   1,980.18/2,972.07 = 1,056.53/x
3. Step 3: Cross multiply
   1,980.18x = 2,972.07 × 1,056.53
4. Step 4: Simplify right side
   1,980.18x = 3,140,066.26
5. Step 5: Solve for x
   x = 3,140,066.26/1,980.18
6. Step 6: Final answer
   x = 1,585.75