Finding the Fourth Proportional to 156,815.21, 216,389.34 and 88,818.59

Step by Step Solution

1. Step 1: Write the proportion equation
   156,815.21 : 216,389.34 = 88,818.59 : x
2. Step 2: Convert to fraction form
   156,815.21/216,389.34 = 88,818.59/x
3. Step 3: Cross multiply
   156,815.21x = 216,389.34 × 88,818.59
4. Step 4: Simplify right side
   156,815.21x = 19,219,396,069.83
5. Step 5: Solve for x
   x = 19,219,396,069.83/156,815.21
6. Step 6: Final answer
   x = 122,560.79