Finding the Fourth Proportional to 1,445.68, 2,164.42 and 1,188.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.68 : 2,164.42 = 1,188.72 : x
2. Step 2: Convert to fraction form
   1,445.68/2,164.42 = 1,188.72/x
3. Step 3: Cross multiply
   1,445.68x = 2,164.42 × 1,188.72
4. Step 4: Simplify right side
   1,445.68x = 2,572,889.34
5. Step 5: Solve for x
   x = 2,572,889.34/1,445.68
6. Step 6: Final answer
   x = 1,779.71