Finding the Fourth Proportional to 155,911.57, 215,157.98 and 84,291.57

Step by Step Solution

1. Step 1: Write the proportion equation
   155,911.57 : 215,157.98 = 84,291.57 : x
2. Step 2: Convert to fraction form
   155,911.57/215,157.98 = 84,291.57/x
3. Step 3: Cross multiply
   155,911.57x = 215,157.98 × 84,291.57
4. Step 4: Simplify right side
   155,911.57x = 18,136,003,905.89
5. Step 5: Solve for x
   x = 18,136,003,905.89/155,911.57
6. Step 6: Final answer
   x = 116,322.38