Finding the Fourth Proportional to 112,389.16, 155,090.82 and 64,643.31

Step by Step Solution

1. Step 1: Write the proportion equation
   112,389.16 : 155,090.82 = 64,643.31 : x
2. Step 2: Convert to fraction form
   112,389.16/155,090.82 = 64,643.31/x
3. Step 3: Cross multiply
   112,389.16x = 155,090.82 × 64,643.31
4. Step 4: Simplify right side
   112,389.16x = 10,025,583,955.41
5. Step 5: Solve for x
   x = 10,025,583,955.41/112,389.16
6. Step 6: Final answer
   x = 89,204.19