Finding the Fourth Proportional to 42,909,475.68, 64,362,787.92 and 18,648,426.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,909,475.68 : 64,362,787.92 = 18,648,426.96 : x
2. Step 2: Convert to fraction form
   42,909,475.68/64,362,787.92 = 18,648,426.96/x
3. Step 3: Cross multiply
   42,909,475.68x = 64,362,787.92 × 18,648,426.96
4. Step 4: Simplify right side
   42,909,475.68x = 1,200,264,749,468,090.50
5. Step 5: Solve for x
   x = 1,200,264,749,468,090.50/42,909,475.68
6. Step 6: Final answer
   x = 27,972,020.88