Finding the Fourth Proportional to 139,131.84, 208,513.20 and 75,789.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,131.84 : 208,513.20 = 75,789.48 : x
2. Step 2: Convert to fraction form
   139,131.84/208,513.20 = 75,789.48/x
3. Step 3: Cross multiply
   139,131.84x = 208,513.20 × 75,789.48
4. Step 4: Simplify right side
   139,131.84x = 15,803,107,001.14
5. Step 5: Solve for x
   x = 15,803,107,001.14/139,131.84
6. Step 6: Final answer
   x = 113,583.68