Finding the Fourth Proportional to 70,389.18, 105,419.07 and 61,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   70,389.18 : 105,419.07 = 61,105.50 : x
2. Step 2: Convert to fraction form
   70,389.18/105,419.07 = 61,105.50/x
3. Step 3: Cross multiply
   70,389.18x = 105,419.07 × 61,105.50
4. Step 4: Simplify right side
   70,389.18x = 6,441,684,981.89
5. Step 5: Solve for x
   x = 6,441,684,981.89/70,389.18
6. Step 6: Final answer
   x = 91,515.27