Finding the Fourth Proportional to 139,437.72, 192,580.74 and 107,987.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,437.72 : 192,580.74 = 107,987.04 : x
2. Step 2: Convert to fraction form
   139,437.72/192,580.74 = 107,987.04/x
3. Step 3: Cross multiply
   139,437.72x = 192,580.74 × 107,987.04
4. Step 4: Simplify right side
   139,437.72x = 20,796,224,073.61
5. Step 5: Solve for x
   x = 20,796,224,073.61/139,437.72
6. Step 6: Final answer
   x = 149,143.46