Finding the Fourth Proportional to 139,532.52, 193,061.96 and 121,664.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,532.52 : 193,061.96 = 121,664.76 : x
2. Step 2: Convert to fraction form
   139,532.52/193,061.96 = 121,664.76/x
3. Step 3: Cross multiply
   139,532.52x = 193,061.96 × 121,664.76
4. Step 4: Simplify right side
   139,532.52x = 23,488,837,028.53
5. Step 5: Solve for x
   x = 23,488,837,028.53/139,532.52
6. Step 6: Final answer
   x = 168,339.52