Finding the Fourth Proportional to 1,111.58, 1,667.58 and 526.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.58 : 1,667.58 = 526.58 : x
2. Step 2: Convert to fraction form
   1,111.58/1,667.58 = 526.58/x
3. Step 3: Cross multiply
   1,111.58x = 1,667.58 × 526.58
4. Step 4: Simplify right side
   1,111.58x = 878,114.28
5. Step 5: Solve for x
   x = 878,114.28/1,111.58
6. Step 6: Final answer
   x = 789.97