Finding the Fourth Proportional to 22,791,005.42, 31,451,679.15 and 12,478,688.06

Step by Step Solution

1. Step 1: Write the proportion equation
   22,791,005.42 : 31,451,679.15 = 12,478,688.06 : x
2. Step 2: Convert to fraction form
   22,791,005.42/31,451,679.15 = 12,478,688.06/x
3. Step 3: Cross multiply
   22,791,005.42x = 31,451,679.15 × 12,478,688.06
4. Step 4: Simplify right side
   22,791,005.42x = 392,475,693,076,055.94
5. Step 5: Solve for x
   x = 392,475,693,076,055.94/22,791,005.42
6. Step 6: Final answer
   x = 17,220,639.71