Finding the Fourth Proportional to 139,719.53, 209,461.75 and 60,774.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,719.53 : 209,461.75 = 60,774.30 : x
2. Step 2: Convert to fraction form
   139,719.53/209,461.75 = 60,774.30/x
3. Step 3: Cross multiply
   139,719.53x = 209,461.75 × 60,774.30
4. Step 4: Simplify right side
   139,719.53x = 12,729,891,081.09
5. Step 5: Solve for x
   x = 12,729,891,081.09/139,719.53
6. Step 6: Final answer
   x = 91,110.32