Finding the Fourth Proportional to 103,686.10, 155,401.15 and 70,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   103,686.10 : 155,401.15 = 70,406.10 : x
2. Step 2: Convert to fraction form
   103,686.10/155,401.15 = 70,406.10/x
3. Step 3: Cross multiply
   103,686.10x = 155,401.15 × 70,406.10
4. Step 4: Simplify right side
   103,686.10x = 10,941,188,907.02
5. Step 5: Solve for x
   x = 10,941,188,907.02/103,686.10
6. Step 6: Final answer
   x = 105,522.23