Finding the Fourth Proportional to 1,404.10, 2,106.15 and 526.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.10 : 2,106.15 = 526.60 : x
2. Step 2: Convert to fraction form
   1,404.10/2,106.15 = 526.60/x
3. Step 3: Cross multiply
   1,404.10x = 2,106.15 × 526.60
4. Step 4: Simplify right side
   1,404.10x = 1,109,098.59
5. Step 5: Solve for x
   x = 1,109,098.59/1,404.10
6. Step 6: Final answer
   x = 789.90