Finding the Fourth Proportional to 1,870.34, 2,580.53 and 1,207.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.34 : 2,580.53 = 1,207.58 : x
2. Step 2: Convert to fraction form
   1,870.34/2,580.53 = 1,207.58/x
3. Step 3: Cross multiply
   1,870.34x = 2,580.53 × 1,207.58
4. Step 4: Simplify right side
   1,870.34x = 3,116,186.53
5. Step 5: Solve for x
   x = 3,116,186.53/1,870.34
6. Step 6: Final answer
   x = 1,666.10