Finding the Fourth Proportional to 1,980.38, 2,975.96 and 1,056.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.38 : 2,975.96 = 1,056.59 : x
2. Step 2: Convert to fraction form
   1,980.38/2,975.96 = 1,056.59/x
3. Step 3: Cross multiply
   1,980.38x = 2,975.96 × 1,056.59
4. Step 4: Simplify right side
   1,980.38x = 3,144,364.29
5. Step 5: Solve for x
   x = 3,144,364.29/1,980.38
6. Step 6: Final answer
   x = 1,587.76