Finding the Fourth Proportional to 139,406.99, 208,992.93 and 60,461.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,406.99 : 208,992.93 = 60,461.76 : x
2. Step 2: Convert to fraction form
   139,406.99/208,992.93 = 60,461.76/x
3. Step 3: Cross multiply
   139,406.99x = 208,992.93 × 60,461.76
4. Step 4: Simplify right side
   139,406.99x = 12,636,079,756.76
5. Step 5: Solve for x
   x = 12,636,079,756.76/139,406.99
6. Step 6: Final answer
   x = 90,641.65