Finding the Fourth Proportional to 139,885.08, 209,857.46 and 45,120.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,885.08 : 209,857.46 = 45,120.59 : x
2. Step 2: Convert to fraction form
   139,885.08/209,857.46 = 45,120.59/x
3. Step 3: Cross multiply
   139,885.08x = 209,857.46 × 45,120.59
4. Step 4: Simplify right side
   139,885.08x = 9,468,892,411.10
5. Step 5: Solve for x
   x = 9,468,892,411.10/139,885.08
6. Step 6: Final answer
   x = 67,690.51