Finding the Fourth Proportional to 139,060.57, 191,902.42 and 78,643.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,060.57 : 191,902.42 = 78,643.08 : x
2. Step 2: Convert to fraction form
   139,060.57/191,902.42 = 78,643.08/x
3. Step 3: Cross multiply
   139,060.57x = 191,902.42 × 78,643.08
4. Step 4: Simplify right side
   139,060.57x = 15,091,797,368.25
5. Step 5: Solve for x
   x = 15,091,797,368.25/139,060.57
6. Step 6: Final answer
   x = 108,526.79