Finding the Fourth Proportional to 139,147.63, 208,751.69 and 45,649.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,147.63 : 208,751.69 = 45,649.87 : x
2. Step 2: Convert to fraction form
   139,147.63/208,751.69 = 45,649.87/x
3. Step 3: Cross multiply
   139,147.63x = 208,751.69 × 45,649.87
4. Step 4: Simplify right side
   139,147.63x = 9,529,487,510.78
5. Step 5: Solve for x
   x = 9,529,487,510.78/139,147.63
6. Step 6: Final answer
   x = 68,484.73