Finding the Fourth Proportional to 1,980.18, 2,970.18 and 1,156.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.18 : 2,970.18 = 1,156.80 : x
2. Step 2: Convert to fraction form
   1,980.18/2,970.18 = 1,156.80/x
3. Step 3: Cross multiply
   1,980.18x = 2,970.18 × 1,156.80
4. Step 4: Simplify right side
   1,980.18x = 3,435,904.22
5. Step 5: Solve for x
   x = 3,435,904.22/1,980.18
6. Step 6: Final answer
   x = 1,735.15