Finding the Fourth Proportional to 139,913.58, 193,029.40 and 89,641.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,913.58 : 193,029.40 = 89,641.74 : x
2. Step 2: Convert to fraction form
   139,913.58/193,029.40 = 89,641.74/x
3. Step 3: Cross multiply
   139,913.58x = 193,029.40 × 89,641.74
4. Step 4: Simplify right side
   139,913.58x = 17,303,491,287.16
5. Step 5: Solve for x
   x = 17,303,491,287.16/139,913.58
6. Step 6: Final answer
   x = 123,672.71