Finding the Fourth Proportional to 139,869.52, 209,834.18 and 45,105.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,869.52 : 209,834.18 = 45,105.10 : x
2. Step 2: Convert to fraction form
   139,869.52/209,834.18 = 45,105.10/x
3. Step 3: Cross multiply
   139,869.52x = 209,834.18 × 45,105.10
4. Step 4: Simplify right side
   139,869.52x = 9,464,590,397.62
5. Step 5: Solve for x
   x = 9,464,590,397.62/139,869.52
6. Step 6: Final answer
   x = 67,667.29