Finding the Fourth Proportional to 139,146.88, 208,750.56 and 45,649.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,146.88 : 208,750.56 = 45,649.12 : x
2. Step 2: Convert to fraction form
   139,146.88/208,750.56 = 45,649.12/x
3. Step 3: Cross multiply
   139,146.88x = 208,750.56 × 45,649.12
4. Step 4: Simplify right side
   139,146.88x = 9,529,279,363.51
5. Step 5: Solve for x
   x = 9,529,279,363.51/139,146.88
6. Step 6: Final answer
   x = 68,483.60