Finding the Fourth Proportional to 139,881.09, 209,777.88 and 60,915.81

Step by Step Solution

1. Step 1: Write the proportion equation
   139,881.09 : 209,777.88 = 60,915.81 : x
2. Step 2: Convert to fraction form
   139,881.09/209,777.88 = 60,915.81/x
3. Step 3: Cross multiply
   139,881.09x = 209,777.88 × 60,915.81
4. Step 4: Simplify right side
   139,881.09x = 12,778,789,480.28
5. Step 5: Solve for x
   x = 12,778,789,480.28/139,881.09
6. Step 6: Final answer
   x = 91,354.66