Finding the Fourth Proportional to 1,345.19, 1,858.71 and 1,111.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.19 : 1,858.71 = 1,111.91 : x
2. Step 2: Convert to fraction form
   1,345.19/1,858.71 = 1,111.91/x
3. Step 3: Cross multiply
   1,345.19x = 1,858.71 × 1,111.91
4. Step 4: Simplify right side
   1,345.19x = 2,066,718.24
5. Step 5: Solve for x
   x = 2,066,718.24/1,345.19
6. Step 6: Final answer
   x = 1,536.38