Finding the Fourth Proportional to 139,490.72, 192,501.18 and 85,046.03

Step by Step Solution

1. Step 1: Write the proportion equation
   139,490.72 : 192,501.18 = 85,046.03 : x
2. Step 2: Convert to fraction form
   139,490.72/192,501.18 = 85,046.03/x
3. Step 3: Cross multiply
   139,490.72x = 192,501.18 × 85,046.03
4. Step 4: Simplify right side
   139,490.72x = 16,371,461,129.32
5. Step 5: Solve for x
   x = 16,371,461,129.32/139,490.72
6. Step 6: Final answer
   x = 117,365.95