Finding the Fourth Proportional to 139,870.52, 209,835.68 and 45,106.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,870.52 : 209,835.68 = 45,106.10 : x
2. Step 2: Convert to fraction form
   139,870.52/209,835.68 = 45,106.10/x
3. Step 3: Cross multiply
   139,870.52x = 209,835.68 × 45,106.10
4. Step 4: Simplify right side
   139,870.52x = 9,464,869,165.65
5. Step 5: Solve for x
   x = 9,464,869,165.65/139,870.52
6. Step 6: Final answer
   x = 67,668.79