Finding the Fourth Proportional to 139,145.88, 208,749.06 and 45,648.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,145.88 : 208,749.06 = 45,648.12 : x
2. Step 2: Convert to fraction form
   139,145.88/208,749.06 = 45,648.12/x
3. Step 3: Cross multiply
   139,145.88x = 208,749.06 × 45,648.12
4. Step 4: Simplify right side
   139,145.88x = 9,529,002,140.77
5. Step 5: Solve for x
   x = 9,529,002,140.77/139,145.88
6. Step 6: Final answer
   x = 68,482.10