Finding the Fourth Proportional to 64,809, 89,475.30 and 42,491.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,809 : 89,475.30 = 42,491.88 : x
2. Step 2: Convert to fraction form
   64,809/89,475.30 = 42,491.88/x
3. Step 3: Cross multiply
   64,809x = 89,475.30 × 42,491.88
4. Step 4: Simplify right side
   64,809x = 3,801,973,710.56
5. Step 5: Solve for x
   x = 3,801,973,710.56/64,809
6. Step 6: Final answer
   x = 58,664.29