Finding the Fourth Proportional to 42,959.31, 64,352.74 and 21,898.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,959.31 : 64,352.74 = 21,898.50 : x
2. Step 2: Convert to fraction form
   42,959.31/64,352.74 = 21,898.50/x
3. Step 3: Cross multiply
   42,959.31x = 64,352.74 × 21,898.50
4. Step 4: Simplify right side
   42,959.31x = 1,409,228,692.52
5. Step 5: Solve for x
   x = 1,409,228,692.52/42,959.31
6. Step 6: Final answer
   x = 32,803.80