Finding the Fourth Proportional to 139,215.52, 208,814.64 and 60,274.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,215.52 : 208,814.64 = 60,274.72 : x
2. Step 2: Convert to fraction form
   139,215.52/208,814.64 = 60,274.72/x
3. Step 3: Cross multiply
   139,215.52x = 208,814.64 × 60,274.72
4. Step 4: Simplify right side
   139,215.52x = 12,586,243,957.90
5. Step 5: Solve for x
   x = 12,586,243,957.90/139,215.52
6. Step 6: Final answer
   x = 90,408.34