Finding the Fourth Proportional to 42,889.55, 64,312.38 and 17,922.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,889.55 : 64,312.38 = 17,922.78 : x
2. Step 2: Convert to fraction form
   42,889.55/64,312.38 = 17,922.78/x
3. Step 3: Cross multiply
   42,889.55x = 64,312.38 × 17,922.78
4. Step 4: Simplify right side
   42,889.55x = 1,152,656,638.02
5. Step 5: Solve for x
   x = 1,152,656,638.02/42,889.55
6. Step 6: Final answer
   x = 26,875.00