Finding the Fourth Proportional to 103,688.10, 155,404.15 and 70,408.10

Step by Step Solution

1. Step 1: Write the proportion equation
   103,688.10 : 155,404.15 = 70,408.10 : x
2. Step 2: Convert to fraction form
   103,688.10/155,404.15 = 70,408.10/x
3. Step 3: Cross multiply
   103,688.10x = 155,404.15 × 70,408.10
4. Step 4: Simplify right side
   103,688.10x = 10,941,710,933.62
5. Step 5: Solve for x
   x = 10,941,710,933.62/103,688.10
6. Step 6: Final answer
   x = 105,525.23