Finding the Fourth Proportional to 99,478.74, 149,099.42 and 69,329.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,478.74 : 149,099.42 = 69,329.72 : x
2. Step 2: Convert to fraction form
   99,478.74/149,099.42 = 69,329.72/x
3. Step 3: Cross multiply
   99,478.74x = 149,099.42 × 69,329.72
4. Step 4: Simplify right side
   99,478.74x = 10,337,021,040.76
5. Step 5: Solve for x
   x = 10,337,021,040.76/99,478.74
6. Step 6: Final answer
   x = 103,911.86