Finding the Fourth Proportional to 139,491.83, 209,237.76 and 64,571.01

Step by Step Solution

1. Step 1: Write the proportion equation
   139,491.83 : 209,237.76 = 64,571.01 : x
2. Step 2: Convert to fraction form
   139,491.83/209,237.76 = 64,571.01/x
3. Step 3: Cross multiply
   139,491.83x = 209,237.76 × 64,571.01
4. Step 4: Simplify right side
   139,491.83x = 13,510,693,493.34
5. Step 5: Solve for x
   x = 13,510,693,493.34/139,491.83
6. Step 6: Final answer
   x = 96,856.53