Finding the Fourth Proportional to 66,075.62, 91,058.46 and 64,861

Step by Step Solution

1. Step 1: Write the proportion equation
   66,075.62 : 91,058.46 = 64,861 : x
2. Step 2: Convert to fraction form
   66,075.62/91,058.46 = 64,861/x
3. Step 3: Cross multiply
   66,075.62x = 91,058.46 × 64,861
4. Step 4: Simplify right side
   66,075.62x = 5,906,142,774.06
5. Step 5: Solve for x
   x = 5,906,142,774.06/66,075.62
6. Step 6: Final answer
   x = 89,384.60