Finding the Fourth Proportional to 1,907.98, 2,861.98 and 521.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,907.98 : 2,861.98 = 521.46 : x
2. Step 2: Convert to fraction form
   1,907.98/2,861.98 = 521.46/x
3. Step 3: Cross multiply
   1,907.98x = 2,861.98 × 521.46
4. Step 4: Simplify right side
   1,907.98x = 1,492,417.77
5. Step 5: Solve for x
   x = 1,492,417.77/1,907.98
6. Step 6: Final answer
   x = 782.20