Finding the Fourth Proportional to 139,026.57, 208,540.91 and 91,035.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,026.57 : 208,540.91 = 91,035.58 : x
2. Step 2: Convert to fraction form
   139,026.57/208,540.91 = 91,035.58/x
3. Step 3: Cross multiply
   139,026.57x = 208,540.91 × 91,035.58
4. Step 4: Simplify right side
   139,026.57x = 18,984,642,695.58
5. Step 5: Solve for x
   x = 18,984,642,695.58/139,026.57
6. Step 6: Final answer
   x = 136,554.06