Finding the Fourth Proportional to 1,191.80, 1,779.59 and 1,051.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.80 : 1,779.59 = 1,051.81 : x
2. Step 2: Convert to fraction form
   1,191.80/1,779.59 = 1,051.81/x
3. Step 3: Cross multiply
   1,191.80x = 1,779.59 × 1,051.81
4. Step 4: Simplify right side
   1,191.80x = 1,871,790.56
5. Step 5: Solve for x
   x = 1,871,790.56/1,191.80
6. Step 6: Final answer
   x = 1,570.56