Finding the Fourth Proportional to 386,978.00, 534,011.63 and 214,906.86

Step by Step Solution

1. Step 1: Write the proportion equation
   386,978.00 : 534,011.63 = 214,906.86 : x
2. Step 2: Convert to fraction form
   386,978.00/534,011.63 = 214,906.86/x
3. Step 3: Cross multiply
   386,978.00x = 534,011.63 × 214,906.86
4. Step 4: Simplify right side
   386,978.00x = 114,762,761,532.25
5. Step 5: Solve for x
   x = 114,762,761,532.25/386,978.00
6. Step 6: Final answer
   x = 296,561.47