Finding the Fourth Proportional to 1,985.31, 2,978.01 and 830.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.31 : 2,978.01 = 830.43 : x
2. Step 2: Convert to fraction form
   1,985.31/2,978.01 = 830.43/x
3. Step 3: Cross multiply
   1,985.31x = 2,978.01 × 830.43
4. Step 4: Simplify right side
   1,985.31x = 2,473,028.84
5. Step 5: Solve for x
   x = 2,473,028.84/1,985.31
6. Step 6: Final answer
   x = 1,245.66