Finding the Fourth Proportional to 139,039.56, 191,862.90 and 78,607.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,039.56 : 191,862.90 = 78,607.08 : x
2. Step 2: Convert to fraction form
   139,039.56/191,862.90 = 78,607.08/x
3. Step 3: Cross multiply
   139,039.56x = 191,862.90 × 78,607.08
4. Step 4: Simplify right side
   139,039.56x = 15,081,782,329.33
5. Step 5: Solve for x
   x = 15,081,782,329.33/139,039.56
6. Step 6: Final answer
   x = 108,471.16