Finding the Fourth Proportional to 139,064.58, 191,907.94 and 78,647.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,064.58 : 191,907.94 = 78,647.08 : x
2. Step 2: Convert to fraction form
   139,064.58/191,907.94 = 78,647.08/x
3. Step 3: Cross multiply
   139,064.58x = 191,907.94 × 78,647.08
4. Step 4: Simplify right side
   139,064.58x = 15,092,999,109.82
5. Step 5: Solve for x
   x = 15,092,999,109.82/139,064.58
6. Step 6: Final answer
   x = 108,532.30