Finding the Fourth Proportional to 139,423.06, 208,963.27 and 64,441.77

Step by Step Solution

1. Step 1: Write the proportion equation
   139,423.06 : 208,963.27 = 64,441.77 : x
2. Step 2: Convert to fraction form
   139,423.06/208,963.27 = 64,441.77/x
3. Step 3: Cross multiply
   139,423.06x = 208,963.27 × 64,441.77
4. Step 4: Simplify right side
   139,423.06x = 13,465,962,983.79
5. Step 5: Solve for x
   x = 13,465,962,983.79/139,423.06
6. Step 6: Final answer
   x = 96,583.47