Finding the Fourth Proportional to 139,858.74, 193,019.00 and 85,407.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,858.74 : 193,019.00 = 85,407.91 : x
2. Step 2: Convert to fraction form
   139,858.74/193,019.00 = 85,407.91/x
3. Step 3: Cross multiply
   139,858.74x = 193,019.00 × 85,407.91
4. Step 4: Simplify right side
   139,858.74x = 16,485,348,470.70
5. Step 5: Solve for x
   x = 16,485,348,470.70/139,858.74
6. Step 6: Final answer
   x = 117,871.42