Finding the Fourth Proportional to 156,709, 216,258.42 and 89,641

Step by Step Solution

1. Step 1: Write the proportion equation
   156,709 : 216,258.42 = 89,641 : x
2. Step 2: Convert to fraction form
   156,709/216,258.42 = 89,641/x
3. Step 3: Cross multiply
   156,709x = 216,258.42 × 89,641
4. Step 4: Simplify right side
   156,709x = 19,385,621,027.22
5. Step 5: Solve for x
   x = 19,385,621,027.22/156,709
6. Step 6: Final answer
   x = 123,704.58