Finding the Fourth Proportional to 139,428.54, 209,120.94 and 60,521.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,428.54 : 209,120.94 = 60,521.58 : x
2. Step 2: Convert to fraction form
   139,428.54/209,120.94 = 60,521.58/x
3. Step 3: Cross multiply
   139,428.54x = 209,120.94 × 60,521.58
4. Step 4: Simplify right side
   139,428.54x = 12,656,329,699.89
5. Step 5: Solve for x
   x = 12,656,329,699.89/139,428.54
6. Step 6: Final answer
   x = 90,772.88