Finding the Fourth Proportional to 139,945.61, 209,959.32 and 45,173.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,945.61 : 209,959.32 = 45,173.58 : x
2. Step 2: Convert to fraction form
   139,945.61/209,959.32 = 45,173.58/x
3. Step 3: Cross multiply
   139,945.61x = 209,959.32 × 45,173.58
4. Step 4: Simplify right side
   139,945.61x = 9,484,614,138.77
5. Step 5: Solve for x
   x = 9,484,614,138.77/139,945.61
6. Step 6: Final answer
   x = 67,773.58