Finding the Fourth Proportional to 139,145.84, 208,628.04 and 91,617.14

Step by Step Solution

1. Step 1: Write the proportion equation
   139,145.84 : 208,628.04 = 91,617.14 : x
2. Step 2: Convert to fraction form
   139,145.84/208,628.04 = 91,617.14/x
3. Step 3: Cross multiply
   139,145.84x = 208,628.04 × 91,617.14
4. Step 4: Simplify right side
   139,145.84x = 19,113,904,348.61
5. Step 5: Solve for x
   x = 19,113,904,348.61/139,145.84
6. Step 6: Final answer
   x = 137,365.98