Finding the Fourth Proportional to 139,548.70, 209,173.98 and 64,581.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,548.70 : 209,173.98 = 64,581.58 : x
2. Step 2: Convert to fraction form
   139,548.70/209,173.98 = 64,581.58/x
3. Step 3: Cross multiply
   139,548.70x = 209,173.98 × 64,581.58
4. Step 4: Simplify right side
   139,548.70x = 13,508,786,123.29
5. Step 5: Solve for x
   x = 13,508,786,123.29/139,548.70
6. Step 6: Final answer
   x = 96,803.38